PORSCHE RACING HISTORYJo Siffert (CH)
1968 : Daytona 24 Hours - 1st overall : Daytona 24 Hours - 2nd overall : Sebring 12 Hours - 1st overall : Targa Florio - 3rd in class : Nürburgring 1000 km - 1st overall : Watkins Glen 6 Hours - 2nd in class : Zeltweg 1000 km - 1st overall
4 February 1968 - Daytona 24 Hours - International Championship for Makes
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 54 | Porsche 907 LH 2.2 | 907-005 | P | Vic Elford (GB)/Jochen Neerpasch (D)/Rolf Stommelen (D)/Jo Siffert (CH) | Porsche Works Team (D) | 1st | 1st | 5th | 673 laps - Hans Hermann also drove |
4 February 1968 - Daytona 24 Hours - International Championship for Makes
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 52 | Porsche 907 LH 2.2 | 907-008 | P | Jo Siffert (CH)/Hans Herrmann (D) | Porsche Works Team (D) | 2nd | 2nd | 4th | 659 laps |
23 March 1968 - Sebring 12 Hours - International Championship for Makes
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 49 | Porsche 907 2.2 | 907-024 | P3.0 | Jo Siffert (CH)/Hans Herrmann (D) | Porsche Automobile Co. (D) | 1st | 1st | 1st | 237 laps |
25 April 1968 - Monza 1000 km - International Championship for Makes
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 4 | Porsche 908 LH | 908-003 | P3.0 | Jo Siffert (CH)/Hans Herrmann (D) | Porsche System Engineering (D) | 19th | 4th | 2nd | 73 laps |
5 May 1968 - Targa Florio - International Championship for Makes
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 226 | Porsche 907 2.2 | 907-029 | P3.0 | Jo Siffert (CH)/Rolf Stommelen (D) | Porsche System Engineering (D) | 18th | 3rd | 9 laps |
19 May 1968 - Nürburgring 1000 km - International Championship for Makes
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 2 | Porsche 908 | 908-008 | P3.0 | Jo Siffert (CH)/Vic Elford (GB) | Porsche (D) | 1st | 1st | 27th | 44 laps |
14 July 1968 - Watkins Glen 6 Hours - International Championship for Makes
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 2 | Porsche 908 | 908-009 | P3.0 | Hans Herrmann (D)/Tetsu Ikuzawa (J)/Jo Siffert (CH) | Porsche System Engineering, Ltd. (D) | 6th | 2nd | 3rd | 257 laps |
14 July 1968 - Watkins Glen 6 Hours - International Championship for Makes
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 1 | Porsche 908 | 908-012 | P3.0 | Jo Siffert (CH)/Vic Elford (GB) | Porsche System Engineering, Ltd. (D) | DNF | 1st | 109 laps - Wheel Bearing |
25 August 1968 - Zeltweg 1000 km - International Championship for Makes
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 1 | Porsche 908 | 908-005 | P3.0 | Jo Siffert (CH) | Porsche System Engineering Ltd. (D) | 1st | 1st | 1st | 157 laps - #017? |
29 September 1968 - Le Mans 24 Hours - International Championship for Makes
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 31 | Porsche 908 | 908-015 | P3.0 | Jo Siffert (CH)/Hans Herrmann (D) | Porsche System Engineering (D) | DNF | 1st | 59 laps - Clutch |